2.2.24 [HTML] Section 14.2.3, Header style information: the STYLE element

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V0090:

The specification states:

 type = content-type [CI]
  
 This attribute specifies the style sheet language of the element's contents and 
 overrides the default style sheet language. The style sheet language is specified 
 as a content type (e.g., "text/css"). Authors must supply a value for this 
 attribute; there is no default value for this attribute.

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If the type attribute is not used it defaults to CSS and applies the style.